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This timer counts down 90 minutes (5400 seconds) and plays an alarm at zero. It is handy for a long nap covering a full sleep cycle, a long deep-work block or a movie-length break. It runs entirely in your browser: nothing is uploaded.
Press Start on this page. The 90 minute timer is already set to 1:30:00 and sounds an alarm when it reaches zero. Press Pause to stop it and Reset to start over.
Common uses are a long nap covering a full sleep cycle, a long deep-work block or a movie-length break.
Usually yes. The timer follows the clock, so it stays accurate in a background tab, and the remaining time shows in the tab title. Keep the page open until it finishes, because it cannot ring after you close it. Some browsers block sound until you have clicked on the page, which pressing Start counts as.
90 minutes are 5400 seconds (1.5 hours).
See also: All timers · 10 second timer · 15 second timer · Pomodoro timer · Stopwatch